In this what is the purpose of newfunction?

In this what is the purpose of newfunction? Why don't its existence makes any change ?
Can anyone help me out please ?

#include <iostream>
#include <algorithm>
#include <vector>
bool newfunction (int m, int n)
{
  return (m==n);
}
int main ()
{
  int newints[] = {1,2,3,4,5,1,2,3,4,5};
  std::vector<int> haystack (newints,newints+10);
  int patt1[] = {1,2,3};
  std::vector<int>::iterator ti;
  ti = std::find_end (haystack.begin(), haystack.end(), patt1, patt1+3);
  if (ti!=haystack.end())
  std::cout << "patt1 last found at position " << (ti-haystack.begin()) << '\n';
  int patt2[] = {4,5,1};
  ti = std::find_end (haystack.begin(), haystack.end(), patt2, patt2+3, newfunction);
  if (ti!=haystack.end())
  std::cout << "patt2 last found at position " << (ti-haystack.begin()) << '\n';
  return 0;
}